Method of and system for increasing the reliability and accuracy of location estimation in a hybrid positioning system
First Claim
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1. A method for determining a position of a device using signals from multiple positioning systems, the method comprising:
- analyzing signals from at least two of a satellite positioning system (“
SPS”
), a Wi-Fi positioning system, and a cell positioning system (“
CPS”
);
determining for each of the at least two of the SPS, the Wi-Fi positioning system, and the CPS, a corresponding initial position estimate of the device and at least one corresponding parameter;
assessing for each of the corresponding initial position estimates a quality of the initial position estimate; and
selecting one of the corresponding initial position estimates as a final position estimate of the device based on the assessed qualities of the initial position estimates;
wherein an elapsed time after a fix (TAF) is used as an indicator of the quality of the initial position estimate of the SPS.
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Abstract
Methods and systems of hybrid positioning are provided for increasing the reliability and accuracy of location estimation. According to embodiments of the invention, the quality of reported locations from specific sources of location is assessed. Satellite and non-satellite positioning systems provide initial positioning estimates. For each positioning system relevant information is collected and based on the collected information each system is assigned appropriate weight.
281 Citations
41 Claims
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1. A method for determining a position of a device using signals from multiple positioning systems, the method comprising:
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analyzing signals from at least two of a satellite positioning system (“
SPS”
), a Wi-Fi positioning system, and a cell positioning system (“
CPS”
);determining for each of the at least two of the SPS, the Wi-Fi positioning system, and the CPS, a corresponding initial position estimate of the device and at least one corresponding parameter; assessing for each of the corresponding initial position estimates a quality of the initial position estimate; and selecting one of the corresponding initial position estimates as a final position estimate of the device based on the assessed qualities of the initial position estimates; wherein an elapsed time after a fix (TAF) is used as an indicator of the quality of the initial position estimate of the SPS. - View Dependent Claims (2, 29, 30, 35, 36, 37, 38, 39)
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3. A method for determining a position of a device using signals from multiple positioning systems, the method comprising:
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analyzing signals from at least two of a satellite positioning system (“
SPS”
), a Wi-Fi positioning system, and a cell positioning system (“
CPS”
);determining for each of the at least two of the SPS, the Wi-Fi positioning system, and the CPS, a corresponding initial position estimate of the device and corresponding parameters; assessing for each of the corresponding initial position estimates a quality of the initial position estimate; and selecting one of the corresponding initial position estimates as a final position estimate of the device based on the assessed qualities of the initial position estimates; and switching to another one of the corresponding initial position estimates as a second final position estimate of the device based on at least one of the history of the previously reported positions, the at least one corresponding SPS parameter, the at least one corresponding Wi-Fi positioning system parameter, and at least one corresponding CPS parameter; wherein a combination of an elapsed time to obtain a fix (TTF) and a TAF is used as an indicator of the quality of the initial position estimate of the SPS. - View Dependent Claims (4)
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5. A method for determining a position of a device using signals from multiple positioning systems, the method comprising:
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analyzing signals from at least two of a satellite positioning system (“
SPS”
), a Wi-Fi positioning system, and a cell positioning system (“
CPS”
);determining for each of the at least two of the SPS, the Wi-Fi positioning system, and the CPS, a corresponding initial position estimate of the device and corresponding parameters; assessing for each of the corresponding initial position estimates a quality of the initial position estimate; and selecting one of the corresponding initial position estimates as a final position estimate of the device based on the assessed qualities of the initial position estimates; wherein an elapsed time to obtain a fix (TTF) is used as an indicator of the quality of the initial position estimate of the SPS. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 31, 32, 33, 34)
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40. A method for determining a position of a device using signals from multiple positioning systems, the method comprising:
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analyzing signals from at least two of a satellite positioning system (“
SPS”
), a Wi-Fi positioning system, and a cell positioning system (“
CPS”
);determining for each of the at least two of a SPS, Wi-Fi positioning system, and CPS, a corresponding initial position estimate of the device based on the analyzed signals; assessing for each of the corresponding initial position estimates a quality of the initial position estimate; combining the corresponding initial position estimates to determine a combined initial position estimate; and selecting either one of the corresponding initial position estimates of the device or the combined initial position estimate as a final position estimate of the device based on the assessed qualities of the initial position estimates; wherein an elapsed time to obtain a fix (TTF) is used as an indicator of the quality of the initial position estimate of the SPS.
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41. A non-transitory computer-readable storage device containing a set of instructions that causes a mobile device to:
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analyze signals from at least two of a satellite positioning system (“
SPS”
), a Wi-Fi positioning system, and a cell positioning system (“
CPS”
);determine for each of the at least two of a SPS, Wi-Fi positioning system, and CPS, a corresponding initial position estimate of the device based on the analyzed signals; and assess for each of the corresponding initial position estimates a quality of the initial position estimate; select one of the corresponding initial position estimates of the device as a final position estimate of the device based on the assessed qualities of the initial position estimates; wherein an elapsed time to obtain a fix (TTF) is used as an indicator of the quality of the initial position estimate of the SPS.
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Specification